From: Nikolay Borisov <kernel@kyup.com>
Date: Thu, 3 Mar 2016 09:54:57 +0000 (+0100)
Subject: quota: Fix possible GPF due to uninitialised pointers
X-Git-Tag: v4.5.1~81
X-Git-Url: http://git.hungrycats.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b060595b62fdd94949b7e025edb6b1b709d1338c;p=linux

quota: Fix possible GPF due to uninitialised pointers

commit ab73ef46398e2c0159f3a71de834586422d2a44a upstream.

When dqget() in __dquot_initialize() fails e.g. due to IO error,
__dquot_initialize() will pass an array of uninitialized pointers to
dqput_all() and thus can lead to deference of random data. Fix the
problem by properly initializing the array.

Signed-off-by: Nikolay Borisov <kernel@kyup.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c
index 3c3b81bb6dfe..850d17fa0aa3 100644
--- a/fs/quota/dquot.c
+++ b/fs/quota/dquot.c
@@ -1398,7 +1398,7 @@ static int dquot_active(const struct inode *inode)
 static int __dquot_initialize(struct inode *inode, int type)
 {
 	int cnt, init_needed = 0;
-	struct dquot **dquots, *got[MAXQUOTAS];
+	struct dquot **dquots, *got[MAXQUOTAS] = {};
 	struct super_block *sb = inode->i_sb;
 	qsize_t rsv;
 	int ret = 0;
@@ -1415,7 +1415,6 @@ static int __dquot_initialize(struct inode *inode, int type)
 		int rc;
 		struct dquot *dquot;
 
-		got[cnt] = NULL;
 		if (type != -1 && cnt != type)
 			continue;
 		/*